Yeah, looks like the 3ds has a limit on how big loaded images can be.
If you still want to read manga on your 3ds, I suggest resizing the images with a program I found called Fotosizer.
http://www.fotosizer.com/Download.aspx
It's a great program because it's free, and you can convert a lot of images all at once instead of selecting them one by one. If you want to use this, go to the destination settings and make it so the output file name is the same as the original.
I tried resizing your first two pages to be 75% of their original size and it loaded! And they still looked quite nice.